Writing instrument



FIG. 1 is a perspective view of a first embodiment of the writing instrument showing my new design;

FIG. 2 is a left view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a perspective view of a second embodiment of the writing instrument showing my new design;

FIG. 9 is a left view thereof;

FIG. 10 is a front view thereof;

FIG. 11 is a right view thereof;

FIG. 12 is a rear view thereof;

FIG. 13 is a bottom view thereof; and,

FIG. 14 is a top view thereof. 

I claim the ornamental design for a writing instrument, as shown and described. 